Method for preparing precipitated silicas, novel precipitated silicas and their uses, in particular for strengthening polymers

摘要

The invention relates to a novel process for the preparation of a precipitated silica, in which:a silicate is reacted with an acidifying agent, so as to obtain a suspension of precipitated silica,said suspension of precipitated silica is filtered, so as to obtain a filtration cake,said filtration cake is subjected to a liquefaction operation comprising the addition of an aluminum compound,after the liquefaction operation, a drying stage is carried out,characterized in that a mixture of polycarboxylic acids is added to the filtration cake, during or after the liquefaction operation.;It also relates to novel precipitated silicas and to their uses.